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Presentation transcript:

satellite dish

Sat4free - Satellite dish 1 This means that any satellite dish which is positioned to receive these services will be capable of receiving Freesat, with the addition of a suitable receiver (or Television with receiver built in)

Sat4free - Satellite dish 1 For users who do not currently have a satellite dish, Freesat offers an installation service which is made available through retailers and which is advertised in a leaflet included with Freesat receivers. A suitable dish may also be installed by the user or a non-Freesat-affiliated installer.

Dish Network - Earlier satellite dishes 1 Dish Network's first Satellite dish|satellite antenna was simply called the Dish Network Dish

Dish Network - Higher capacity satellite dishes 1 Originally, Dish Network high-definition subscribers required two separate satellite dishes

Media of China - Satellite dishes 1 Black market satellite dishes are nonetheless prolific, numbering well into the tens of millions.PC World, [ ticle/194755/illegal_satellite_tv_in_china_b rings_cnn_to_the_masses.html 'Illegal Satellite TV in China Brings CNN to the Masses'], April 22,

Satellite dish 1 A 'satellite dish' is a dish-shaped type of parabolic antenna designed to receive microwaves from communications satellites, which transmit data transmissions or Broadcasting|broadcasts, such as satellite television.

Satellite dish - Principle of operation 1 Direct broadcast satellite dishes use an LNBF, which integrates the feedhorn with the LNB

Satellite dish - Principle of operation 1 The theoretical gain (Antenna gain|directive gain) of a dish increases as the frequency increases. The actual gain depends on many factors including surface finish, accuracy of shape, feedhorn matching. A typical value for a consumer type 60cm satellite dish at 11.75GHz is dB.

Satellite dish - Others 1 * Automatic Tracking Satellite Dish

Focal cloud - Satellite dish effects 1 A focal cloud can render a satellite dish rather inefficient in relation to its size in specific frequencies. If the imperfections are formed in a way that the phase shifts of reflected waves, at a large portion of the dish, are near 180 degrees between them and the feed horn, this results in self- cancellation of the specific frequency.

Automatic Tracking Satellite Dish 1 'Automatic Tracking Satellite Dishes' are satellite dishes used while a vehicle is in motion. Automatic tracking satellite dishes utilize gyroscopes, GPS position Sensors, and uses unique satellite identification data and an integrated Digital Video Broadcasting|DVB decoder to aid in identification of the satellite that it is pointing at.

Satellite dishes 1 A 'satellite dish' is a dish-shaped type of parabolic antenna designed to receive electromagnetic signals from satellites, which transmit data transmissions or Broadcasting|broadcasts, such as satellite television.

Satellite dishes - Principle of operation 1 Direct broadcast satellite dishes use an LNBF, which integrates the feedhorn with the LNB

Satellite dishes - History 1 Parabolic antennas referred to as dish antennas had been in use long before satellite television. The term satellite dish was coined in 1978 during the beginning of the satellite television industry, and came to refer to dish antennas that send and/or receive signals from communications satellites. Taylor Howard of San Andreas, California built a large dish in 1976 and became the first person to receive satellite television signals using it.

Satellite dishes - History 1 The satellite dishes of the early 1980s were in diameter and made of fibreglass or solid aluminum or steel

Satellite dishes - History 1 Satellite dishes made of wire mesh first came out in the mid-1980s, and were at first in diametre. The size shrunk to a few years later, and continued to get smaller reducing to feet by the late 1980s and by the early 1990s. Larger dishes continued to be used, however. In December 1988 Luxembourg's Astra 1A satellite began transmitting television signals on the Ku band|Ku band analogue. This allowed small dishes (20cm) to be used for the first time.

Satellite dishes - History 1 This great decrease of dish size also allowed satellite dishes to be installed on vehicles

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